java/kudu-flume-sink/src/main/java/org/kududb/flume/sink/SimpleKuduEventProducer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.kududb.flume.sink;

import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.FlumeException;
import org.apache.flume.conf.ComponentConfiguration;
import org.kududb.client.Insert;
import org.kududb.client.KuduTable;
import org.kududb.client.Operation;
import org.kududb.client.PartialRow;

import java.util.Collections;
import java.util.List;

/**
 * <p>A simple serializer that generates one {@link Insert} per {@link Event} by writing the event
 * body into a BINARY column. The headers are discarded.
 *
 * <p><strong>Simple Kudu Event Producer configuration parameters</strong>
 *
 * <table cellpadding=3 cellspacing=0 border=1>
 * <tr><th>Property Name</th><th>Default</th><th>Required?</th><th>Description</th></tr>
 * <tr><td>producer.payloadColumn</td><td>payload</td><td>No</td><td>The name of the BINARY column to write the Flume the event body to.</td></tr>
 * </table>
 */
public class SimpleKuduEventProducer implements KuduEventProducer {
  private byte[] payload;
  private KuduTable table;
  private String payloadColumn;

  public SimpleKuduEventProducer(){
  }

  @Override
  public void configure(Context context) {
    payloadColumn = context.getString("payloadColumn","payload");
  }

  @Override
  public void configure(ComponentConfiguration conf) {
  }

  @Override
  public void initialize(Event event, KuduTable table) {
    this.payload = event.getBody();
    this.table = table;
  }

  @Override
  public List<Operation> getOperations() throws FlumeException {
    try {
      Insert insert = table.newInsert();
      PartialRow row = insert.getRow();
      row.addBinary(payloadColumn, payload);

      return Collections.singletonList((Operation) insert);
    } catch (Exception e){
      throw new FlumeException("Failed to create Kudu Insert object!", e);
    }
  }

  @Override
  public void close() {
  }
}